test(@angular-devkit/build-angular): add dev-server builder build budget behavior tests

This change adds expanded unit tests for the dev-server builder's build budget behavior using the builder test harness.

Author: clydin

packages/angular_devkit/build_angular/src/dev-server/budgets_spec.ts

@@ -0,0 +1,32 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import { Type as BudgetType } from '../../../';
+import { serveWebpackBrowser } from '../../index';
+import { BASE_OPTIONS, DEV_SERVER_BUILDER_INFO, describeBuilder, setupBrowserTarget } from '../setup';
+
+describeBuilder(serveWebpackBrowser, DEV_SERVER_BUILDER_INFO, (harness) => {
+  describe('Behavior: "browser builder budgets"', () => {
+    beforeEach(() => {
+      setupBrowserTarget(harness, {
+        // Add a budget error for any file over 100 bytes
+        budgets: [{ type: BudgetType.All, maximumError: '100b' }],
+        optimization: true,
+      });
+    });
+
+    it('should ignore budgets defined in the "browserTarget" options', async () => {
+      harness.useTarget('serve', {
+        ...BASE_OPTIONS,
+      });
+
+      const { result } = await harness.executeOnce();
+
+      expect(result?.success).toBe(true);
+    });
+  });
+});

packages/angular_devkit/build_angular/src/dev-server/tests/behavior/build-budgets_spec.ts

@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import { buildWebpackBrowser } from '../../browser';
+import { Schema as BrowserSchema } from '../../browser/schema';
 import { BASE_OPTIONS as BROWSER_BASE_OPTIONS } from '../../browser/tests/setup';
 import { BuilderHarness } from '../../testing/builder-harness';
 import { Schema } from '../schema';
@@ -33,8 +34,12 @@ export const BASE_OPTIONS = Object.freeze<Schema>({
  */
 export const BUILD_TIMEOUT = 15000;
 
-export function setupBrowserTarget<T>(harness: BuilderHarness<T>): void {
+export function setupBrowserTarget<T>(
+  harness: BuilderHarness<T>,
+  extraOptions?: Partial<BrowserSchema>,
+): void {
   harness.withBuilderTarget('build', buildWebpackBrowser, {
     ...BROWSER_BASE_OPTIONS,
+    ...extraOptions,
   });
 }